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Linux kernel mirror (for testing)
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kernel
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linux
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_PAGE_H
10#define _ASM_PAGE_H
11
12#include <spaces.h>
13
14/*
15 * PAGE_SHIFT determines the page size
16 */
17#ifdef CONFIG_PAGE_SIZE_4KB
18#define PAGE_SHIFT 12
19#endif
20#ifdef CONFIG_PAGE_SIZE_8KB
21#define PAGE_SHIFT 13
22#endif
23#ifdef CONFIG_PAGE_SIZE_16KB
24#define PAGE_SHIFT 14
25#endif
26#ifdef CONFIG_PAGE_SIZE_64KB
27#define PAGE_SHIFT 16
28#endif
29#define PAGE_SIZE (1UL << PAGE_SHIFT)
30#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
31
32#ifndef __ASSEMBLY__
33
34#include <linux/pfn.h>
35#include <asm/io.h>
36
37/*
38 * It's normally defined only for FLATMEM config but it's
39 * used in our early mem init code for all memory models.
40 * So always define it.
41 */
42#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
43
44extern void clear_page(void * page);
45extern void copy_page(void * to, void * from);
46
47extern unsigned long shm_align_mask;
48
49static inline unsigned long pages_do_alias(unsigned long addr1,
50 unsigned long addr2)
51{
52 return (addr1 ^ addr2) & shm_align_mask;
53}
54
55struct page;
56
57static inline void clear_user_page(void *addr, unsigned long vaddr,
58 struct page *page)
59{
60 extern void (*flush_data_cache_page)(unsigned long addr);
61
62 clear_page(addr);
63 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
64 flush_data_cache_page((unsigned long)addr);
65}
66
67extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
68 struct page *to);
69struct vm_area_struct;
70extern void copy_user_highpage(struct page *to, struct page *from,
71 unsigned long vaddr, struct vm_area_struct *vma);
72
73#define __HAVE_ARCH_COPY_USER_HIGHPAGE
74
75/*
76 * These are used to make use of C type-checking..
77 */
78#ifdef CONFIG_64BIT_PHYS_ADDR
79 #ifdef CONFIG_CPU_MIPS32
80 typedef struct { unsigned long pte_low, pte_high; } pte_t;
81 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
82 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
83 #else
84 typedef struct { unsigned long long pte; } pte_t;
85 #define pte_val(x) ((x).pte)
86 #define __pte(x) ((pte_t) { (x) } )
87 #endif
88#else
89typedef struct { unsigned long pte; } pte_t;
90#define pte_val(x) ((x).pte)
91#define __pte(x) ((pte_t) { (x) } )
92#endif
93typedef struct page *pgtable_t;
94
95/*
96 * For 3-level pagetables we defines these ourselves, for 2-level the
97 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
98 */
99#ifdef CONFIG_64BIT
100
101typedef struct { unsigned long pmd; } pmd_t;
102#define pmd_val(x) ((x).pmd)
103#define __pmd(x) ((pmd_t) { (x) } )
104
105#endif
106
107/*
108 * Right now we don't support 4-level pagetables, so all pud-related
109 * definitions come from <asm-generic/pgtable-nopud.h>.
110 */
111
112/*
113 * Finall the top of the hierarchy, the pgd
114 */
115typedef struct { unsigned long pgd; } pgd_t;
116#define pgd_val(x) ((x).pgd)
117#define __pgd(x) ((pgd_t) { (x) } )
118
119/*
120 * Manipulate page protection bits
121 */
122typedef struct { unsigned long pgprot; } pgprot_t;
123#define pgprot_val(x) ((x).pgprot)
124#define __pgprot(x) ((pgprot_t) { (x) } )
125
126/*
127 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
128 * pair of pages we only have a single global bit per pair of pages. When
129 * writing to the TLB make sure we always have the bit set for both pages
130 * or none. This macro is used to access the `buddy' of the pte we're just
131 * working on.
132 */
133#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
134
135#endif /* !__ASSEMBLY__ */
136
137/* to align the pointer to the (next) page boundary */
138#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
139
140/*
141 * __pa()/__va() should be used only during mem init.
142 */
143#ifdef CONFIG_64BIT
144#define __pa(x) \
145({ \
146 unsigned long __x = (unsigned long)(x); \
147 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \
148})
149#else
150#define __pa(x) \
151 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
152#endif
153#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
154#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
155
156#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
157
158#ifdef CONFIG_FLATMEM
159
160#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
161
162#elif defined(CONFIG_SPARSEMEM)
163
164/* pfn_valid is defined in linux/mmzone.h */
165
166#elif defined(CONFIG_NEED_MULTIPLE_NODES)
167
168#define pfn_valid(pfn) \
169({ \
170 unsigned long __pfn = (pfn); \
171 int __n = pfn_to_nid(__pfn); \
172 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
173 NODE_DATA(__n)->node_spanned_pages) \
174 : 0); \
175})
176
177#endif
178
179#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
180#define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
181
182#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
183 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
184
185#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
186#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
187
188#include <asm-generic/memory_model.h>
189#include <asm-generic/page.h>
190
191#endif /* _ASM_PAGE_H */